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Research article
Bin Yang
Peking University International Hospital
Corresponding Author
ORCiD: https://orcid.org/0000-0001-7231-6678
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Background: To manage patellofemoral joint disorders, a complete understanding of the in vivo patellofemoral kinematics is critical. However, as one of the parameters of joint kinematics, the location and orientation of patellofemoral finite helical axis (FHA) remains unclear. The purpose of this study is to quantify the location and orientation of the patellar FHA both in vivo and non-invasively at various flexion angles and to relate the FHA to the trans-epicondyle axis (TEA).
Methods: The Magnetic resonance (MR) images of 18 unilateral knees were collected at full extension and at 30°, 60°, 90°, and maximum angle of knee flexion. Three-dimensional models of knee joint at different flexion angles were developed with the MR images, and were used to calculate the patellar tracking and FHA with a spline interpolation algorithm. By using a coordinate system based on the TEA, the FHA tracking was quantified. Six parameters concerning the location and orientation of the patellar FHA were analyzed.
Results: The average patellar FHA of 18 knees drew an L-shaped tracking on the midsagittal plane moving from the posteroinferior side of the TEA to the anterosuperior with knee flexion. Before 90° flexion, the patellar rotational radius decreased slightly, with an average value of 5.65 ± 1.09 cm. During 20° to 90° knee flexion, the average angle between the patellar FHA and TEA was approximately 10° and that between the FHA and coronal plane was maintained at about 0°, while that between the FHA and level plane fluctuated between -10° and 10°.
Conclusions: Patellar FHA was not fixed during flexion, which showed a close relationship with femoral TEA in both location and orientation. The results could help us better understand the patellofemoral joint kinematics and further deal with troublesome patellofemoral disorders.
Keywords
patellofemoral joint, finite helical axis, trans-epicondyle axis, knee
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CURRENT STATUS: Published
View the published article at Journal of Orthopaedic Surgery and Research.
Version 1
Posted 29 Dec, 2020
No community comments so far
Editorial decision: Major revision
On 12 Jan, 2021
Review #4 received
Received 11 Jan, 2021
Review #3 received
Received 04 Jan, 2021
Review #1 received
Received 02 Jan, 2021
Reviewer #6 agreed
On 01 Jan, 2021
Review #5 received
Received 01 Jan, 2021
Reviewer #5 agreed
On 31 Dec, 2020
Review #2 received
Received 29 Dec, 2020
Reviewer #4 agreed
On 25 Dec, 2020
Reviewer #3 agreed
On 22 Dec, 2020
Reviewer #2 agreed
On 22 Dec, 2020
Editor assigned
On 21 Dec, 2020
Reviewers invited
Invitations sent on 21 Dec, 2020
Reviewer #1 agreed
On 21 Dec, 2020
Submission checks complete
On 21 Dec, 2020
Editor invited
On 21 Dec, 2020
First submitted
On 20 Dec, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Orthopedic Surgery
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A new preprint design is coming!
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See the published version of this preprint at Journal of Orthopaedic Surgery and Research.
This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research article
Bin Yang
Peking University International Hospital
Corresponding Author
ORCiD: https://orcid.org/0000-0001-7231-6678
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
View the published article at Journal of Orthopaedic Surgery and Research.
Version 1
Posted 29 Dec, 2020
No community comments so far
Editorial decision: Major revision
On 12 Jan, 2021
Review #4 received
Received 11 Jan, 2021
Review #3 received
Received 04 Jan, 2021
Review #1 received
Received 02 Jan, 2021
Reviewer #6 agreed
On 01 Jan, 2021
Review #5 received
Received 01 Jan, 2021
Reviewer #5 agreed
On 31 Dec, 2020
Review #2 received
Received 29 Dec, 2020
Reviewer #4 agreed
On 25 Dec, 2020
Reviewer #3 agreed
On 22 Dec, 2020
Reviewer #2 agreed
On 22 Dec, 2020
Editor assigned
On 21 Dec, 2020
Reviewers invited
Invitations sent on 21 Dec, 2020
Reviewer #1 agreed
On 21 Dec, 2020
Submission checks complete
On 21 Dec, 2020
Editor invited
On 21 Dec, 2020
First submitted
On 20 Dec, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Orthopedic Surgery
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at Journal of Orthopaedic Surgery and Research.
Background: To manage patellofemoral joint disorders, a complete understanding of the in vivo patellofemoral kinematics is critical. However, as one of the parameters of joint kinematics, the location and orientation of patellofemoral finite helical axis (FHA) remains unclear. The purpose of this study is to quantify the location and orientation of the patellar FHA both in vivo and non-invasively at various flexion angles and to relate the FHA to the trans-epicondyle axis (TEA).
Methods: The Magnetic resonance (MR) images of 18 unilateral knees were collected at full extension and at 30°, 60°, 90°, and maximum angle of knee flexion. Three-dimensional models of knee joint at different flexion angles were developed with the MR images, and were used to calculate the patellar tracking and FHA with a spline interpolation algorithm. By using a coordinate system based on the TEA, the FHA tracking was quantified. Six parameters concerning the location and orientation of the patellar FHA were analyzed.
Results: The average patellar FHA of 18 knees drew an L-shaped tracking on the midsagittal plane moving from the posteroinferior side of the TEA to the anterosuperior with knee flexion. Before 90° flexion, the patellar rotational radius decreased slightly, with an average value of 5.65 ± 1.09 cm. During 20° to 90° knee flexion, the average angle between the patellar FHA and TEA was approximately 10° and that between the FHA and coronal plane was maintained at about 0°, while that between the FHA and level plane fluctuated between -10° and 10°.
Conclusions: Patellar FHA was not fixed during flexion, which showed a close relationship with femoral TEA in both location and orientation. The results could help us better understand the patellofemoral joint kinematics and further deal with troublesome patellofemoral disorders.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
The full text of this article is available to read as a PDF.
This is a list of supplementary files associated with this preprint. Click to download.
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